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Armed police enter the pitch as Celtic's Bobby Lennox is sent off in the 1967 clash with Racing Club of Argentina (Image: Unknown)

The return leg at the impressive El Cilindro stadium in Buenos Aires finished two-one to the home side which set up a play-off to be held at a neutral venue - the Estadio Centenario in Montevideo which had held the first ever World Cup final 37 years earlier.

Before the match manager Jock Stein said that Celtic would "give as much as they are forced to take." These turned out to be fitting words.

A foul on Jimmy Johnstone sparked a scuffle between the two teams’ players. Uruguayan police came on the pitch to calm the trouble before Bobby Lennox and Alfio Basile were sent off in the 42nd minute.

Johnstone saw the next red on the 48th minute after appearing to lash out at a Racing player.

John Hughes saw red in the 74th minute after kicking the Racing goalkeeper who was on the ground.

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Jimmy Johnstone was one of four Celtic players sent off (Image: Scottish News and Sport)

Racing had another player sent off in the 74th minute for punching Celtic’s John Clark. Another melee erupted later on in the game that saw the police once again get involved and Tommy Gemmell kick a Racing player in the groin, which went unpunished. Bertie Auld was then sent off in the 88th minute but refused to leave the field.

By the end of the game six players had been sent off - four for Celtic and two for Racing.

Celtic have never received more red cards in a game than they did that day in Montevideo, but games involving other clubs have seen more sendings off - many more.

The highest number of red cards dished out in a match, as recognised by the Guinness World Records, is 36.